Smashing Pictures

The first image is a reconstruction of a W boson produced in a proton/anti-proton collision. The W boson quickly decays into a tau lepton and tau anti-neutrino. The pencil-like jet in the center is the tau lepton, the neutrino is inferred from energy conservation, and the curved tracks are the remnants of the proton and anti-proton. The second image is a reconstruction of a proton/anti-proton collision that produced a Z boson. The Z boson decayed to an electron and a positron (blue dotted tracks). The other tracks are the remnants of the proton and anti-proton.